CVE-2025-65019

Astro is a web framework. Prior to version 5.15.9, when using Astro's Cloudflare adapter (@astrojs/cloudflare) with output: 'server', the image optimization endpoint (/_image) contains a critical vulnerability in the isRemoteAllowed() function that unconditionally allows data: protocol URLs. This enables Cross-Site Scripting (XSS) attacks through malicious SVG payloads, bypassing domain restrictions and Content Security Policy protections. This issue has been patched in version 5.15.9.

CVSS 3.1

6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2025-11-19

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

Affected

• astro:astro

Packages (OSV)

References

• https://github.com/withastro/astro/commit/9e9c528191b6f5e06db9daf6ad26b8f68016e533
• https://github.com/withastro/astro/security/advisories/GHSA-fvmw-cj7j-j39q

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